Title

Rational Ligand Design for Selective Ion Capture

Lead Author Major

Chemistry

Format

Oral Presentation

Faculty Mentor Name

Qinliang Zhao

Faculty Mentor Department

Chemistry

Abstract/Artist Statement

Two new derivatives of 1, 4, 8, 11- tetraazacyclotetradecane (Cyclam), a saturated macrocylic polyamine, were successfully synthesized through substitution reactions with the assistance of strong bases. The ligands have been characterized by X-ray Crystallography, NMR Spectroscopy and Mass Spectrometry. Direct metallation reactions of both ligands with a variety of metal salts indicated that the pocket in each ligand center was not accessible to most transition metal ions, which was further demonstrated by structural analysis. The Cyclam with four phosphoryl pendant arms, however, was able to hold two lanthanide ions through stabilization from the oxygen atoms on the phosphoryl substituents. The resulting complex exhibited a unique butterfly-shaped geometry.

Location

DeRosa University Center, Room 211

Start Date

26-4-2014 9:00 AM

End Date

26-4-2014 12:00 PM

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Apr 26th, 9:00 AM Apr 26th, 12:00 PM

Rational Ligand Design for Selective Ion Capture

DeRosa University Center, Room 211

Two new derivatives of 1, 4, 8, 11- tetraazacyclotetradecane (Cyclam), a saturated macrocylic polyamine, were successfully synthesized through substitution reactions with the assistance of strong bases. The ligands have been characterized by X-ray Crystallography, NMR Spectroscopy and Mass Spectrometry. Direct metallation reactions of both ligands with a variety of metal salts indicated that the pocket in each ligand center was not accessible to most transition metal ions, which was further demonstrated by structural analysis. The Cyclam with four phosphoryl pendant arms, however, was able to hold two lanthanide ions through stabilization from the oxygen atoms on the phosphoryl substituents. The resulting complex exhibited a unique butterfly-shaped geometry.